In the wings before minute’s warning? (5)
I believe the answer is:
alarm
'warning?' is the definition.
(thesaurus)
'in the wings before minute's' is the wordplay.
'in the wings' becomes 'alar' (zoological term meaning resembling wings).
'before' says to put letters next to each other.
'minute' becomes 'm' (abbreviation).
'alar'+'m'='ALARM'
(Other definitions for alarm that I've seen before include "Frighten, scare" , "Scare with warning device" , "Great concern" , "Warning sound/device" , "Daunt" .)